Engraving machine



FIG. 1 is a front perspective view of an engraving machine showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof, the left side view being a mirror image thereof;

FIG. 4 is a rear view thereof; and,

FIG. 5 is a top view thereof. 

The ornamental design for an engraving machine, as shown and described. 